Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e65b86a0106102a…

MALICIOUS

PDF

77.1 KB Created: 2021-02-21 21:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 33c2e06da5b3c8c7857f8938227078c5 SHA-1: 26b77a61cc707cd15c0cbe8a830bd14ccb96403d SHA-256: 9e65b86a0106102a9deb91470f89ba6e888b926b5ba27b10cef8a79fa76ed589
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs and the PDF's structure suggest it is part of a link farm designed to redirect users to potentially malicious content, likely related to software cracks or phishing lures. No scripts were extracted, but the presence of numerous external URIs points towards a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/wix?keyword=magic+sing+karaoke+apk+crack PDF link annotation
    • http://upgrade4me.com/982741176066wbcl.pdfIn PDF document text
    • https://cdn.sqhk.co/vejurumilef/gdjgLid/xuresotelivizalufekizos.pdfIn PDF document text
    • http://indir-kazan.com/parafisopowozawibuzade67la.pdfIn PDF document text
    • http://blablablacar.online/job_costing_system_format9lwpv.pdfIn PDF document text
    • https://cdn.sqhk.co/gozolijitow/CVnhgXf/screen_master_screenshot_longshot_photo_markup_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/ihYihD3/neposazagazudovulul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471252/normal_5fe54ebb8b0f2.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/iIjejex/2201263753.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/hbPjbks/wildscapes_game_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/f9ijifb/rebanexatu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patotale/blackberry_passport_contacts_to_android.pdfIn PDF document text
    • http://nabiporemug.epizy.com/togalixuja.pdfIn PDF document text
    • http://vixugow.epizy.com/88479239810.pdfIn PDF document text
    • http://volitig.rf.gd/vunaginixalusaxepuvuwav.pdfIn PDF document text
    • http://musezuw.rf.gd/jemawonodowusizexevi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 5136 bytes
SHA-256: cd6c39850eeb6e1b0c774ab3dc8b7380ef47157212a1534c1e1f332409ef80f5
font_01_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 11016 bytes
SHA-256: 349e92905c280a2458f5e609161c7dacdb8468b8c0e696818a86d4dbdc898907

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